Set a compression level per image, from Lossless to 90% loss, with a batch option to apply one setting across several images at once.
Introduction
The standard Image Compressor tool on this site applies one fixed compression setting automatically, the moment you choose a file — useful when you just want a smaller file and don't want to think about it. This tool exists for the times that fixed setting isn't right: when an image needs to stay closer to its original quality, when you're willing to trade more quality for a much smaller file, or when you're compressing a batch of images that don't all need the same treatment.
What Makes This the Advanced Version
Every image you add here gets its own compression control before anything is sent anywhere — nothing uploads until you choose a setting. The choices are Lossless, the least aggressive option this tool offers, or a percentage of quality to trade away, from 5% loss up to 90% loss. A higher percentage asks for more aggressive compression: a smaller file, at the cost of more visible quality loss. Add several images at once and a single "Apply to all" control appears, letting you set one compression level for the whole batch instead of repeating the choice for every file.
This tool changes file weight only — it doesn't resize, crop, or convert to a different format. A JPG stays a JPG, a PNG stays a PNG, at the dimensions you uploaded it at, just compressed. If you need a smaller image in pixel dimensions rather than file size, Image Resizer is the right tool; if you need a different file format entirely, use Image Converter.
Choosing a Compression Level
There's no single correct setting — it depends on what the image is and where it's going:
- Lossless keeps quality as close to the original as this tool's compression allows, with a smaller size reduction. Reasonable for an image where fine detail actually matters — a diagram with small text, a photo you'll zoom into, artwork being reviewed closely.
- A lower loss percentage (5–30%) is a light touch: a modest size reduction that's unlikely to be visible at normal viewing size, suitable for most everyday images.
- A higher loss percentage (50–90%) trades much more visible quality for a much smaller file — worth it when file size matters more than fine detail, such as a background image, a thumbnail, or a batch of photos going somewhere with strict storage or upload limits.
Whatever you choose, the result is never handed back larger than what you uploaded — if a setting wouldn't actually shrink a particular image, you get the original file back rather than a bigger one.
What to Know Before You Compress
- Accepted formats: JPG/JPEG, PNG, WEBP, and SVG, up to 10 MB each. A file that isn't genuinely one of these, no matter its file extension, will be rejected.
- Dimensions and format don't change. Only the file's byte size and internal encoding quality are affected — width, height, and file format stay exactly as uploaded.
- Uploading several images processes each one separately. "Download all" bundles your compressed images into a single ZIP file for convenience; it doesn't merge them into one file.
When This Is the Right Tool
- A mixed batch of images that don't all need the same treatment. A set of photos for a class website might tolerate more compression than a diagram with readable text — setting quality per image (or per small group) handles that in one pass instead of running each image through separately.
- Fine control before a deadline or a storage limit. When a fixed automatic setting either doesn't shrink a file enough or shrinks it more than you'd like, choosing the level yourself gets you closer to what you actually need.
- Comparing quality trade-offs directly. Running the same image through at a few different loss percentages and comparing the results is a fast way to see, concretely, what a given percentage actually costs in visible quality — more informative than guessing from a single default setting.
If you just want a smaller file with no decisions to make, the plain Image Compressor tool does that in one step. Come back here when the default isn't giving you the result you want.
Example
A teacher is preparing a class webpage with a dozen photos from a field trip. Most of the photos can take heavy compression without anyone noticing on a webpage, but two close-up shots of student artwork need to stay sharp. Uploading all twelve at once, applying a high loss percentage to the batch, then individually setting the two artwork photos to Lossless before downloading gets the right trade-off for each image instead of one setting for all of them.
FAQs
What's the difference between this and the regular Image Compressor?
The regular compressor applies one fixed compression setting automatically as soon as you choose a file. This tool lets you choose the setting yourself, per image, from Lossless up to 90% loss, and apply one choice to a whole batch at once.
What does "Lossless" actually do?
It's this tool's least aggressive compression setting, aimed at keeping quality as close as possible to the original rather than maximizing the size reduction. How much a file actually shrinks at that setting still depends on the image itself.
Will this resize my image or change its format?
No. Only file size and internal compression change — the pixel dimensions and file format stay exactly as uploaded. Use Image Resizer to change dimensions or Image Converter to change format.
What file types and sizes are accepted?
JPG/JPEG, PNG, WEBP, and SVG, up to 10 MB per file.
Can the result ever come back bigger than my original?
No — if a chosen setting wouldn't actually reduce the file size, you get back the original file instead of a larger one.
Is my image kept afterward?
No. Images are processed only to complete the compression and are automatically deleted within 2 hours — see the Privacy Policy for details.
Which related tools can I use?
Use Image Compressor for one-click compression with no settings, Image Resizer to change dimensions, or Image Converter to change file format.
